BLU meaning in Regional ?

Answer:

What is Blue Ridge Southern Railroad mean?

The Blue Ridge Southern Railroad (reporting mark BLU) is a Class III shortline railroad operating over 91.8 miles (147.7 kilometres) of track in Western North Carolina. The railroad is owned by Watco of Pittsburg, Kansas, and operates three lines that connect in the Asheville area that were previously owned by Norfolk Southern Railway. The railroad is based out of Canton, North Carolina, and utilizes 11 locomotives. Operations began on 26 July 2014.

reference

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